Case 1: An incident light with a wavelength = 395.21 nm shines on the calcium metal. (b) Will electrons be emitted from the calcium metal? Select your answer from one of the following options. a. No, because the incident photon frequency is smaller than the cutoff frequency. O b. No, because the incident photon wavelength is larger than the longest wavelength. c. Yes, because the incident photon frequency is larger than the cutoff frequency. O d. Yes, because the incident photon wavelength is larger than the longest wavelength. Correct (100.0%) Submit (c) Calculate the energy carried by the photons in the incident light Write the result in terms of 1019 J. Keep 3 decimal places. x10-19J O 1.55 Incorrect (0.0%) Submit (3 attempts remaining) (d) Calculate the max kinetic energy carried by the photo-electrons Write the result in terms of 10-19 J. Keep 3 decimal places. 1.55 x10-19J O Incorrect (0.0%) Submit (3 attempts remaining) (e) Use the classical physics kinetic energy equation to calculate the max speed of the photo-electrons. The mass of an electron is Write the speed in terms of 105 m/s. Keep 3 decimal places. x10°m/s e 5.837 Incorrect (0.0%) Submit (3 attempts remaining)
Case 1: An incident light with a wavelength = 395.21 nm shines on the calcium metal. (b) Will electrons be emitted from the calcium metal? Select your answer from one of the following options. a. No, because the incident photon frequency is smaller than the cutoff frequency. O b. No, because the incident photon wavelength is larger than the longest wavelength. c. Yes, because the incident photon frequency is larger than the cutoff frequency. O d. Yes, because the incident photon wavelength is larger than the longest wavelength. Correct (100.0%) Submit (c) Calculate the energy carried by the photons in the incident light Write the result in terms of 1019 J. Keep 3 decimal places. x10-19J O 1.55 Incorrect (0.0%) Submit (3 attempts remaining) (d) Calculate the max kinetic energy carried by the photo-electrons Write the result in terms of 10-19 J. Keep 3 decimal places. 1.55 x10-19J O Incorrect (0.0%) Submit (3 attempts remaining) (e) Use the classical physics kinetic energy equation to calculate the max speed of the photo-electrons. The mass of an electron is Write the speed in terms of 105 m/s. Keep 3 decimal places. x10°m/s e 5.837 Incorrect (0.0%) Submit (3 attempts remaining)
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Transcribed Image Text:Case 1:
An incident light with a wavelength = 395.21 nm shines on the calcium metal.
(b) Will electrons be emitted from the calcium metal?
Select your answer from one of the following options.
O a. No, because the incident photon frequency is smaller than the cutoff frequency.
O b. No, because the incident photon wavelength is larger than the longest wavelength.
O c. Yes, because the incident photon frequency is larger than the cutoff frequency.
O d. Yes, because the incident photon wavelength is larger than the longest wavelength.
Correct (100.0%)
Submit
(c) Calculate the energy carried by the photons in the incident light Write the result in terms of 10-19 J. Keep 3 decimal places.
1,55
x10-19J O
Incorrect (0.0%)
Submit
(3 attempts remaining)
(d) Calculate the max kinetic energy carried by the photo-electrons Write the result in terms of 10-19 J. Keep 3 decimal places.
1.55
x10-19J O
Incorrect (0.0%)
Submit
(3 attempts remaining)
(e) Use the classical physics kinetic energy equation to calculate the max speed of the photo-electrons. The mass of an electron is 9.11x10A-31 kg.
Write the speed in terms of 105 m/s. Keep 3 decimal places.
x10 m/s e
5.837
Incorrect (0.0%)
Submit
(3 attempts remaining)
Transcribed Image Text:Quantum Physics - Photoelectric Effect 1
Light
Light 22.
Photo-
electrops
KE,
KE, - hf - W.
Photoelectric Effect
Lenard found that light has to be above a certain
frequency in order to observe photoelectrons
W.
f. =
The Planck constant is 6.626x10^-34 J s.
The calcium metal has a work function W0 = 2.71 ev, 1eV = 1.6x10^-19 J.
(a) What is the Cutoff frequency for the calcium metal? Write the result in terms of 1014HZ. Keep 3 decimal places.
6.519
X1014HZ 0
Correct (100.0%)
Submit
What is the longest wavelength of incident light in order to emit photoelectrons from the calcium metal? Write wavelength in nm, 1nm = 10-9 m. Keep 2
decimal places.
458.44
nm 6
Correct (100.0%)
Submit
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